Mechanical stoker.



19M. 1 E 1E 1E 2% VdS am Mm man t5 n w na Dl H. MAoN. PARSON.

MECHANICAL STOKER I APPLIQATION FILED Nov. 22, 1906.

witmg Patented May 21, 19,12.

5 SHEETS-SHEET 2.

N mm mm N @w mukwn wi h1 use:

H. MAGN. PARSON.

MECHANICAL STOKER.'

APPLIOATON FILED Nov. z2, 190e.

LQ?? ma V Patented May 21, 1912 5 SHEETS-SHEET 3.

Snowdon athwnew wines A Y H. MAGN. PARSON.

MECHANICAL STOKER.

' .APPLICATION FILED Nov. z2, 190e. 1,027,149, Patent-,ea M-ayzl, 1912.

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H. MAON. PARSON.

MEGHANICAL STOKER.

APPLICATION Mmm Nov. 22, 1906.

.muted May 21, 1.912.

5 SHEETS-SHEET 5.

points equally distant from the point at' UNITED STATES PATENT OFFTCE,

HENRY MACNU'TT PARSON, OF NEVI YORK, N. Y., ASSIGNOR TO PARSON MANUFAC- TUBING CGMPANY, OF NEW YQRK, N. Y., A CORPORATGN OF NEW YORK.

MECHANICAL soenna.

Specification. of Letters Patent.

Ia-tzci'itcd May 21, itl lil,

Application filed November 22, 1905. Serial No. 344,605.

To all whom it may concern."

,llo it known that l, llnNnr illAcNU'rr lAnsoN, citizen of the. United States of America, and resident of the city, county, and State of New York, have invented certain new and useful lmprovementsl in illet'hanieal Strikers, of which the following is a specification.

My invention relates to a mechanical Stoker, the lstructure of which is simpler, more durable, and better protected from the, effects of heat, and the operation of which ia more etlicient and less complicated in action than that of mechanical stokers heretofore in use. e

All/lore particularly my invention. relates to a stoker, the construction of the parts of which is such that the fuel is advanced with regularity across the grate' at constantly accelerating speed and diminishing depth; the rate of feed and depth of fuel on the grat'e being,r substantially the saine at all which they fuel is fed to the grate,

`Dillicnlty has been experienced iny maintaining an eren and regular flow of fuel across furnace gratos. The fuel advancing;F gratos now in use are notI so constructed as to 'insure an .entirely reliable iow of fuel across them, but on the contrary require. the services ol an attendant, from time to time, to assist the flow. All fuel advancing gratos known to me have positive feeding engagement with the. fuel at comparatirely few' points, appreciably removed troni each other, say the width of the grate har apart.;

in consequence of which when unusually large pieces of coke are formed or forced upon the grate, such pieces, because, of the insutiieientI feeding su rface of the gra te, often fail to move in response to the mechanical action of the sticker, and in stopping on the. `irate surface, impede the feed of fuel over the same, and also, when dislodged by the attendant, strip the grate, leaving it eXL posed to injury by heat.

In my invention, I have designed a `grate, which in feeding, positively engages the fuel at a large number of points of the grate surface, and causes the fuel to be, fed over the same in a smooth continuous sheet, and to continue to be so fed without any outside attention whatever.

I obtain my improved feeding engagement of grate and fuel without' saeritice of proper provision `-for draft. through the grate. The grato is so constructed that the air passes through it` in .auch a direction as not to blow the fuel Atroni the surfactolf thc ,grate bars, and in such quantity as to completely ell'ect the combustion required. Furthermore .by reason of having` the, fuel ad rancing action o t the grate extended over all parts of its surface, I have ,found it uri-- necessary to operate the grate in independent transverse 4wetion: the fuel on my grate will advance, down the .sides at the saine rate as down the center, though sides and center .more as one.

Ny .intention further pres-lents a novel means for accelerating;l the leed of the :fuel as it advances over the grate, so that the more it, is exhausted in its advance, the faster it is fed, to the end that the combustion may be nlaiiit'ained even. tron: the top to` the bottom of the grate, l have also devised a novel meansl for regulating the depth of fuel on the grate, in accordance with 'aryng` conditit'ins, auch as character of fuel used, and intensity of tire desired.

I attain my improved fuelffteed across the Afrate by stepping the 4frate surface, not merely from har to bar, but from 'point to point' on each individual bar. The accelerated fuel :nlvancixre,F action of the grate, .I obtain by ].noviding for decreasing degrees ot' lost motion between reciprocating grate bars and the carriages by which they are carried. The steps of my girate bars project vertically, so that' the air passages between them ma)7 also he vertical, whereby the fuel ma)- not be blown down the grate from bar to bar; and, the bars being reciprocating', and fitting snugly over one another, any misdireeted air drafts between them are precluded.

Haring set forth the objects and nature of my invention, Will now describe an embodiment of the same in connection with the aeconipanyingl` drawings in which-` Figrure I is a View in cross-sectional elevation of an assembled Stoker embodying' the grate of my present invention. Fig'. Il. is a plan View of the Stoker shown in Fig. I, the grate bars being partly broken away to show the supports and operating nicchanism below. Fig, III is a view in elevation of a portion of the right hand Stoker frame side plate. Fig. IV is a detail planyiew of a portion of one of the intermediate l tional litramelp'ieces. Fig. V is alpi rportion of a right hand grate i?. 'Fig` "51. I is' a detail view showing the right and left hand. bars overlapped by the central bar. Fig. VII is a view in cross-sectional elevation on line 7-7 'of Fig. V. Fig. `VIII "View Of a is a detail view in erossfsect-iona-l. elevation,1

on the line 8-'8 of Fig. II, showinggtl manner of mounting the platform and"ridurnat the foot of the grate, and the operating means for the dam. Fig. IXis an enlarged detail view of my device for regulating the stroke of the carriages. Fig. X is a view in elevation of a portion of one ofV the in termediate braces. Fig. XI is 'a detail view 1n cross-sectional elevation showingA the manner of `'mounting'the carriages on the supports. Fig. XII is a view in. cross see tional elevation showing the manner of mounting the stationary bars on the supports.

elevation showing the manner of mounting the movable bars on the carriages.

Referring to Fig. I of the dra-wings, the front platevof, the furnace is indicated at 1, and 'directly in front of' the plate 1 is e hopper 2, communicating with the interior of the furnace through van opening 3, in front wall 1. lVithin the furnace below the opening 3 is a grate, and the fuel. is `fed to the grate from the hopper by a feeder or pusher 4, sliding in guideways 5 and actuated from the power shaft by Ameans ot' a crank 6 on the power shaft, the connecting rod 7 attached at one end to the crank 6, and having loosely mounted thereon a sleeve 8 to which is attached/a bell crank. level' 9 rocking on shaft 10, one arm 11 of' the bell `crank being'pivotally attached to the shaft 12 of the pusher 4. As is common in the art, the stroke of the pusher is varied by adjusting the play of the sleeve 8 .on the rod7 as by means of a nut 1 3 and` lock nut`14. V y

Thegrate` andstoker frame within the furnace Vconsists of right and left hand side frame' pieces 15 (see Fig. III), attached at their forward ends to the front wall l, and at rear ends to a rear plate 16. Intermediate the side plates 15 are plates or braces 17 (see Fig. IV); With their ends-resting in brackets 18 on side pieces l5 and in brackets 19 on' the intermediate supports `17`are transverse braces or rods 20. On the side pieces 15 are upwardly projecting lugs 21, and on the intermediate supports 17 in line with the lugs 2]. are lugs 22 of about 4 twice the fwidth of'the lugs 9.1.

-teterring to Fig-l V, 'the right hand grate bar is `shovvlras providedwith a. soeketjor pocketilvv atfdits right hand` engl adapted te fit over, lugi,21'oxi` the side frame piece" 15 and at its opposite siderwith a similar pocket 24 adapted to fit over the lugQQ on the iiiterznedlate brace 17, whereby the stationary Fig. XIII is a View in cross seebafisfs'upported. s-show'n in Figs. VI 'and VII, Vtheggrate bar L25 is beveled or ta` perd' as at"'26 on its left hand side, and the opposinggrate bar 27 is oppositely bev eled or tapered to interlock with', or be `overlapped with the bar25, and the opposing pockets of the two bars are both en `gag'eidb"Qthe lug 22 on the brace 17. 'The opposi-tefd of the bar 26 is similarly tapered'as shown in Fig. II to interlock with the left hand grate bar, and the latter bar engages a lug corresponding to the lug 2l on the le'ft hand frame side piece.

observedthat the frame side piece 15 carries near its upper endfa. bracket or pocket 27, and a similarvbracket or pocket near its lower end. On the intermediate supports 17, and 0n either side thereof', are brackets or pockets 2S` in line with the pocket-s 27 on the side pieces. The pockets 27 and 28 the movable grate bars are'supported.

29 are shown as provided near their upper and lowerV ends on either side with brackets or pockets 30. These pockets are inline with the pockets 27 and 28 on the side and intermediate frame supports, and are re versed with respect to salue. Engaging on the one hand. vthe bearings Q7`and QS and 30, are krollers 31. These rollers havea eertain amount, of play intheir bearings, and the requisite stroke for the carriages inwthe Stoker frame is thus provided.` I

Referring to Figs. I and II, it will be observed that the carriages on either-'side are provided with a series of upwardly extending bosses 32. These bosses are flat at their vupper ends, and have pockets 3S, open at the sides of thc carriage. The carriages are shaped rto the slope of the, grate, and the gage the alternate Vor-n'lovable bars` of the grate. s f l Y `For the sake of expediency in manufacmovable grate bars from a single pattern. and the bars shown iu Figs. V and VII well as `the stationzir)r bars.' Referring to these figures. the bar 25 is shown as pro-` vided on'its under fare and at either side with a dependent lug let. The lugs 34 serve as hearingsI or siu'iports for the in orable bars and rest. in "the pockets flfl o't the bosses 32.

the lpoelmts in the laisses 32 are consider-alilyl the steps otthe grate descend. It will Atheretore he seen that the lugs Cl-t it quite loosely iu the bearings ou the carriage at the iop of the grate, and here considerable play in Referring to Figs. III and IV, it will be` serve bearings for the carriages on which I consequently represent the movable bars as lVhel-easthe 'lugs 3ft are of a uniform size,

wider at the. top ot the carriage than at. the bottom,gradually `deereafslug in width as Referring to Figs. I and II the carriages i i on the other hand the pockets or bearings loo bosses 3Q appear as a seriesv of steps to euture, I prefer to cast luy-stationary and l y roet/,lee

their bearings at this point, but that the extent of this play gradl'eally decreases toward the fool, of the {gi-aio.

The carriage (ser Figs. ll and lll) are locked to more together by nnans oi4 a rod bot-toni olf the carriages.

Referring to Figs. V and Vil, the grato l bars are shown as having a (lat upper face in altitude with thel slope of the bar.

37, and a sloping upper face 38. 'lhe face 37 serves to support the forward end of the bar next above, and acts. in conjunction with the bar above to cause the fuel upon actuation of the carriages to be forced from the face 37 to the face 38. The sloping face 38 of the bar is shown as provided with a series of vertically disposed transverse ribs 39 flush at their upper ends with the face of the bar, whereby the ribs gradually increajse n this construction the front edges 40 of the bars act to engage positively from behind the fuel lying on the grate and each rib 39 to the extent that it rises above the edge 40 or rib 39d directlyhforward of it, also positively engages the fuel, and when the bars are `advanced by' theearriage, forces the fuel forward. The ribs 39 when viewed in front or rear. elevation are seen to overlap each posed'air passages. The continuous-surface thuspresented for pushing the fuel results in any increased feeding efficiency for the grate. The faces 38 of the bars for the en tir .,'iength of the slope therefore present gripping or feeding surfaces for the fuel, and as the bars largely overlap each other, the fuel is engaged practically over the entire surface of the grate, instead of at aseries 1ofpoints as 40, as would be the ease, were the bars continually lat from front to rear. Between the ribs 39 and through the faces 37 oft-he bars, are vertically disposed passages 42 for draft. By thus designing Athe bars so that the ribs 3f) are vertical, the air passages 42 may also be vertical, and the fuel is ,properly maintained on the grate instead of being blown oil", as would be the case were the air passages 42 required to be horizontally disposed in order to get the stepped fuel engaging surface.

. The grate carriages and consequently .the movable grate bars yare actuated by means "ff shafts 43 attached to one or more of the carriages, being shown in the drawing as attached to the two end carriages. It is obvious that since the carriages are locked to each other by means of the rod 35, an actual-ing rod for each carriage is unneces sary. 'lhe shaft or rod 43 extends through an elongated bearing. 4l, projecting .inwardly troni the front .plate of the furnace, and at a` point outside 4of the front plate is V :onnected 'to an eccentric 45 on the shaft 46.

Also fastened to the shaft 4G is a ratchet wheel 117 operated from the power 'shaft by a pawl i8 carried on an arm Vli). which in turn is urtuated by a crank 5() on the power l shaft. Mounted on the shaft 46 adjacent to fitting,r in lugrs 2l() dejnrndent t'roni tho` ratchet wheel 4T .is a bracket 5l (seo hier iX) having;` a curved slot 52 adjacfnii.l the teeth of the ratchet wheel. Uwrlyiug con tain oi' the teeth ol'l the ratchet wheel and supported by a bolt 5P) in slot iff is a curved plate 5ft. By loosening' tinl bolt 53 and adjustinp,- the position of the saine in slot 52, the position of the plato 54 over the teeth olf the ratchet Wheel may be adjusted at will. Preferably the edge of the slot is marked to serve as a `faire for ileierlniningr the position v of' the plate 54. '.llnl plato M overlies more or less of that portion ol' the ratchet wheel adapted to be engaged by (he pawl 48, and when interposed between pawl and the ratchet wheel, prevents the pavvl from engaging the wheel until it has passed beyond the end 55 of the interposiinr plate.. By varying the position of the plate .fi-fl, the point of engagement ot' the pawl 'with the ratchet wheel is similarly varied and the extent to which the ratchet wheel is turned by the pawl is also varied. 'As the throw of the eccentric Lv5 is determined by the Inovement of the ratchet wheel 47, the throw of the carriage bars is determined by the adjusted position of the plate 54 in the slot 52. In this manner, there is provided a ready means forA varyingr the throw of the earriages within considerable limits without any waste of space.

Mounted on the end plate. 1G at the rear of the stokor and at thtl foot of the grate, is a platform 5t for the fuel. This platform is provided with air passages 57. Pivotal] y mounted in brackets 58 on the plate 16 is a dam 5S) for regulating the amount of fuel that the grate will maintain. 'lhis dam is preferably in sections as shown in Fig. II and is movable on ite` pivots by means of one or more rods (30. These rods. pass through holes in the plate 16, and carry at their end rollers (il adapted to move on ways (32 and engage cam surfaces (33 on the underside of the dam. lBy moving the roller along the ways, the darn is raised or lowered at will. The rod at its forward end passes through the front plate l of the furnace and through a yoke (hlwvhere it threads through a milled wheel (35 held in t-he yoke. By turning the wheel 65, the rod 60 is advanced or receded, and the position of the dam 59 adjusted.

At the upper end of the grate and bet.w'een the top grate bar and the opening through the wall l to the hopper. is shown ineans for coking the fuel before il reaches the grate, and for properly breaking the coke before feeding it to the grate. This eoliing device which consists of a cohing is pushed on to the `-cokingr surface bythe pusher where itis cokcd, broken, and fed to the gg'atc. The position of the plate 5i is adjusted to `rive the carriage the proper stroke and the position of the dam adjusted` to accord with conditions such as characterr ot "fuel and intensity of tire desired,-to regulate the capacity of the grate..

The fuel upon' reaching the top reciprocating bar ot' the grate is advanced by this bar, slowly because of play between this bar and the carriage.l From the top'` bar the fuel is" fed to the bar below and so on down the grate., moving' faster, andV decreasingin depth as the lost motion between the grate, bars and the carriages decrease-i lecause of the stepped surfaces of the grratc'lmrs, the fuel-istin-` gaged, over the entire sloping tace of each bar, in additionto beingr engaged `at the tips ot the bars, and consequently there is little or no opportunity tor pieces ot fuel 'of unusual or irregular sizes and forms to rest' at any spot on the 2grate and delay the teed. The fuel, whatever itsecharacter, iS steadily and regularly advanced until it reaches the foot ofthe g'ate entirely exi haustcdiof combustiblemater-inl. i,

able to do this*expeditiously 1Vhcn any section of the'grate is burned or injured it may be readilyremovedivithout. displacinlr any other Section. It is merely necessary to uncouple the movable carriage from its driving" eccentric so thaty the movable frate sections may he pushed out t'rom under the stationary sections. Then since the adjacentsections ot my'grate bar loosely overlap -cach other` 'urcd sections may be removed by simply liiitingthe. saine. remove `a section of a grate bar irithout. rc- .moving the entire bar or displacing any other part of the stoker vtrame, vand to `be is of great importance. i

As the movableg sitiiononflhe carriage only by engagement ot the lugs 34 thereon with thel upwardly disposed pockets `33 in the bosses 32 on the carriages and the. weight. ot the fixed bars,

it will be apparent that ivlien the carriage.,

is moved forward as above described so that the mov-able barsv are ldisengra'ged 'from lthe,`

t v N l n l'r diminishes fronrthe top tothe bottom ortho grate. i

fixed bars;l thel tormcr are unlocked, am may be lifted from the carriages,V As' been described, there is some play or lost. motion between the bar:`- and carriages, and it the traverse ot the carriage is not suliicient to clear the movable bars,'tl1c bars the large-,amount of loose' ing gate, some o't the others and a mo at their bev, 'cled edges, and also rest loosely on` the carn'iovable carriage- 'ate bars are heldin po the preferable embodiment of my invention,

fet itis obvious that the particular structure described is capable of considerable variation Within the scope of the invention.

Having thus described my invention, what l claim and. desire to secure by Letters Pat `cntc 1. In a mechanical Stoker, a fuel advancing grate, some of reciprocating movement with respect to the others, and a movable carriage on which the reciprocating bars are so mountedas to have lost motion with respect'thereto.

Q. ln a mechanical stolzer, a. fuel adva-ncy me Grate, some ot the, bars ot' which .have

reciprocating movement with respect to the, others, and a movable carriage on which the reciprocating bars are so mounted as to have diti'erent degrees of lost motion with respect thereto.

3. In a mechanical stoker, a fuel advancbars of which have` reciprocating movement with respect to the vable carriage ony Which the recipro ating bars are so mounted as to have a decreasing` degree of lost;niotion with 'ree spect thereto. as the t'ucl advances over the grate, whereby the fuel is fed faster as .it advances.. i i

et. Ina mechanical Stoker, a stepped, fuel adyancing grate, the bars ot which are alternately stationary and reciprocating, af

movable. carriage t'or I'iictuatinw the recipro- 'cating bars, and connections between therecip'ro "ating bars` and'the carriage providing a lost motion Vbetween thosame which decreases as the steps of the. grate descend, whereby the fuel is ted faster as it ad Yances. "f L).*ln a mechanical stoker. a. stepped fuel advancing grate, the bars. of which are ab ternately stationary and reciprocating, ay foi'iact-miting the reciprocating; bars, and connections between the reciprocatingflmrsand the carriage providing dill'erent degrees of lost motion bet-Ween the carriage and the. several reciproca-ting bars. t. ln a inechani al stoker, a fuel advancing `grate, the bars of which are alternately stationary and movable,means for actuating the movable bars, and means connecting the movable bars to their actuating means, Such the bars of which have A connecting means being constructed t0 Ioi vide a lost motion `bet-Ween the grate. and the. actuating means,`wlfneh gradually the ribs being spaced `one from the other,y the spaces extending througl'i the section forming apertures therein and the tops of the ribs being of increasing altitude to form steps, certain of the ribs having a fuel pushing surface disposed j toward the next rib, thepushing surface of a higher step eXten/hng above the top of i-iurfaces being at an angle approaching 90 degrees to the said plane of movement.

ln a mechanical Stoker, a fuel advane ginie, alternate sections of which move a :mit and each section of Vwhich has individual ribs, the ribs being spaced one from taoth: the spaces extending through the sf-etions to form apertures therein and the to l'orm'steps, certain of the ribs having a l'uel wishing surface disposed toward the next rib and placed at an angle to the direction of the nun'emert thereof7 the pushing surface of a higher step extending above and below the top of the pushing surface of the next lower step so that the combined pro-- jeetion of the pushing surfaces of the ribs on a plane at right angles lo the plane of movement of the Sect-ion is substantially continuous,.thc pushing sui-faces being` at an angle approaching il() degrees to the said plane of movementu." in a mechanical striker, a fuel advancing grate having individual sections, each movable as a unit. and each in turn having individual ribs, the ribs being spaeed one Vtrom the other,the spaces extei'idingthrough the .section to t'orm apertures therein, the ops oi" the ribs being of inra'easilig altitude,

io torni steps, the grate see-tions having up-` rsarfllj` directed air passages and eaeh .rib having a Vfuel pushing sui't'aee, the pushing surface ol' a higher step extending above the top of the pushing surface of the next liner step so that the combined projection oI thil pushing surfaces of the ribs ,un a plane at righi. angles lo the plane of movement oif the :tion is substantially continuous, the pushing"surfaces being at an angle approaching il() degrees to the said plane of nuwemcfit.

l0. Vhn a i'nechanieal stoker7 a l'uel advancin;- grate having bars extending' lah-,rally to the direction ot' the ilow oi' the I'uel over the grate and each bar having' a serif-s of projections on its fuel supporting surface,

the tops ol' which increase in elevation toward the top of the g'ate Vthe bars having' upwardly directed air passages between srt-'nl projections, the horizontal cross-seetimis ol thepassages being elongated in a direction transverse to the flow ot' the l'uel.

l'l. in a mechanical Stoker, a fuel advancs of lthe ribs being of increasing altitude,

ing grate having bars Which extend laterally to the-direction of flow of fuel over the grate and have on their l'uel supportingT 'aces a series of upwardly projecting transverse ribs between which are apertures eX- tending parallel to the ribs, the tops of the ribs decreasing in altitude toward the outer sides of the bars.

' 2. inta mechanical stoker, a fuel advancing grate having bars which extend laterally to the direction of How of the fuel over the grate and have on their fuel supporting faces a series of upwardly projecting transverse ribs the upper surfaces of Which decrease in altitude toward the outer sides of the bars, the bars having air passages elongated in a direction parallel to the ribs and extending through the bars het-Ween` the ribs.

13. In a mechanical Stoker, a fuel advancing grate, an adjustable dani at. the lower end of the grate for regulating its fuel maintaining capacity, a rod for adjusting the position of the dam, a cam on the dam, and a roller on the rod engaging the cam, whereby sliding Contact is had between the rod and the dani.

14,-. In a mechanical stolzer, a fuel advancing grate, an adjustable dam at the lower end of the grate for regulating its fuel maintaining' capacity'7 a rod for adjusting the position ol the dam, and a cam on `the dam, engaged by the rod.

l5. In a uuaahanieal Stoker, a fuel advancingl grate, an adjustable dam at the lower end of the grate for regulating its fuel maintaining capacity', a rod for adjusting the position of the dam7 a cam on the dam, a roller on the rod engaging the cam, whereby sliding contacty is had between the rod and the dam, and a guideway for the roller.

ltj. In a` mechanical stoker, a l'uel advaneing grate, a receiving platform at the foot of the gratephaving air passages therethrough and a dam at the end of the platform adjustable to various settings in the operation oi the st oher to Vary' the l'uel carrying capacity ol' the grate.

17. ln a mechanical stoker, a fuel advancing grate comprising stationary and inorable bars extending transversely to the direetion of the tlow of the fuel and each formed of over-lapping lengths, driving mechanisms for the movable bars, means hereby they may he released from the drivingr mechanism whereby the movable bars may he \\.'illu.lra\\'n from engagement with the f-:talionary hairs, and the over-lapping edges ol thi'A adjacent bar sections being so formed that when the movable bars are So withdrawn7 the individual bar sections are unloclu-d and may be removed.

18. l i a uurhanieal stolier, a fuel advancing grate'comprising :stationary and movable bars extending transversely to the direi-,tion ol' the llow ol the fuel and eac-h bars, the abutting edges of the adjacent bar l 'sections being so formed that When the movable bars'are withdrawn, the individual bar` lengths are unlocked and may be removed bya singlemotion. y j

A 19. In a mechanical stoker, a fuel advancin' Agrate comprising stationary and movab e bars, extending transversely `tcthe d1'- rection of th How of the fuel` and leach formed of abutting sections, carriages sup` porting the abutting ends of the bar sections, driving mechanism foi-"the carriages, means ivherebythe carriages may be released from the driving mechanism,` so that the movable bars may be moved out of'cngagement with the stationary bars, the ends of the bar sections being so formed that when the mov-A able bars arecyvithdrawn, any lindividual section is unlocked and may be removed fromv the adjacent section and from the carriage bya single movement. 1 l j f 20.v In a mechanical Stoker, a fuel advancing grate comprisin stationary and' movable barsformed o interlocking sections, carriages supportingy the sections, Adriving f mechanism for the carriages, means whereby the carriages may be released from the driv ing mechanism so that the movable barsl may i be' Withdrawn from `engagement with the` stationary bars, the interlocking portions `of the Aadjacent bar sections beingl so formed 1 .i

6 I g n 21,027,149

that when the movable bars are withdraw-n, i

each section is releasedr and may be removed;

from the adjacent section and from the carriage. l 21. In a mechanical Stoker, a fuel advancing grate comprising stationary and movable bars formed ot interlocking sections,

carriages supporting the interlockingends' of the bar sections, driving mechanism for may be released from the driving mecha- 'nism so that the movable bars may be ,withdrawn. from engagement withthe stationary bars, the interlocking edges ofthe adjacent some of thebar sections-are unlocked so that they may be `removedy from ythe adjacent bar .sections and' from' ythe carriage by al single' 22'; In a` mechanical Stoker, a fuel" ad vancing vgrate having bars extendin transvers-'ely to the direction of feed, an means for reciprocating the bars, certain of which are ldivided into a seriesjof ribs with subL stantially fiat fuel advancing surfaces transverse to the direction of" motion of the bars, the tops of theribs decreasing in altitude toward the outer portion of the bars.

se i

`Signed by me at New York city, N. Y., n, this 19th day of November, 1906.

HENRY MAGNUTT rARsoN.

i Witnesses: VVENDELL l?. Brianna.

WM. L. Mouais.

t 4.6" the carriages, means whereby the carriages a so" bar sections or lengths being so formedr that v j when the movable bars are so. Withdrawn,` n f' ff.'- 

